Abstract
As a summer crop, sunflower (Helianthus annuus L.) is influences commonly by drought stress due to growing generally in rain fed regions without irrigation. Drought affects severely not only seed yield both also other important yield traits which plays important roles on yield formation in sunflower. Therefore, drought resistance became one of the most important goals in the sunflower breeding programs in the world. The study was conducted to determine drought tolerance levels of sunflower genotypes under controlled environmental conditions in Edirne which is a border city in Trakya region which is European part of Turkey and has about 50% of Turkish sunflower production areas. Sunflower restores lines which developed in National Project were evaluated foliar responses against drought stress. Based on study results, the most affected foliar trait was leaf area and it was reduced until 75%. Similarly, leaf number of plants also influenced severely especially from earlier droughts and plants responded about 60% leaf number decreases. On the other hand, on the chlorophyll content of plant leaves, sunflower genotypes responded differently both in earlier (R.3) and later (R.5.1) plant growth stages. While chlorophyll content of sunflower lines increased about 40-50%, some of them decreased about 30%. Similarly, sunflower genotypes responded differently drought stress in their foliar traits depending on when stress applied early or late. As results, sunflower genotypes had different tolerance to drought and higher tolerant ones will be considered to develop tolerant hybrids and will be used as initial material for further breeding purposes.
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Claims 7
Claim · model-written summary
Drought reduced sunflower leaf area by up to 75%.
- Taxon
- Sunflower
Helianthus annuust0 - Treatment
- Drought Stresst0
- Outcome
- leaf areae0
- Direction
- reducede0
- Value
- 75%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the most affected foliar trait was leaf area and it was reduced until 75%”
t0“Sunflower Genotypes under Drought Stress”
Claim · model-written summary
Earlier drought reduced sunflower leaf number by about 60%.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- earlier droughtse0
- Outcome
- leaf numbere0
- Direction
- decreasese0
- Value
- 60%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf number of plants also influenced severely especially from earlier droughts and plants responded about 60% leaf number decreases”
t0“Sunflower”
Claim · model-written summary
Some sunflower lines increased leaf chlorophyll content by about 40-50% under drought.
- Taxon
- sunflowerHelianthus annuuse0
- Treatment
- drought stresse1
- Outcome
- chlorophyll contente0
- Direction
- increasede0
- Value
- 40-50%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“While chlorophyll content of sunflower lines increased about 40-50%, some of them decreased about 30%.”
e1“sunflower genotypes responded differently drought stress in their foliar traits”
Claim · model-written summary
Other sunflower lines decreased leaf chlorophyll content by about 30% under drought.
- Taxon
- sunflowerHelianthus annuuse0
- Treatment
- drought stresse1
- Outcome
- chlorophyll contente0
- Direction
- decreasede0
- Value
- 30%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“While chlorophyll content of sunflower lines increased about 40-50%, some of them decreased about 30%.”
e1“sunflower genotypes responded differently drought stress in their foliar traits”
Claim · model-written summary
Sunflower foliar drought responses differed by genotype and whether stress was applied early or late.
- Taxon
- sunflowerHelianthus annuuse0
- Treatment
- drought stresse0
- Outcome
- foliar traitse0
- Direction
- responded differentlye0
- Qualifier
- early or latee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sunflower genotypes responded differently drought stress in their foliar traits depending on when stress applied early or late”
Claim · model-written summary
Sunflower genotypes differed in drought tolerance.
- Taxon
- sunflowerHelianthus annuuse0
- Outcome
- tolerance to droughte0
- Direction
- differente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sunflower genotypes had different tolerance to drought”
Claim · model-written summary
The authors propose using more drought-tolerant sunflower genotypes to develop tolerant hybrids.
- Taxon
- sunflowerHelianthus annuuse1
- Outcome
- develop tolerant hybridse0
- Qualifier
- higher tolerant onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher tolerant ones will be considered to develop tolerant hybrids and will be used as initial material for further breeding purposes”
e1“sunflower genotypes had different tolerance to drought”
The same questions in other papers
drought · growth · Helianthus annuus (common sunflower)Results differ
49 papers in the same direction as this paper · 9 in the opposite direction
- negative
- negative
- positive
55 papers more in this group
See all 59 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.